ExtraKindOrNumArgs - Either the kind of C++ special name or operator-id (if the value is one of the CXX* enumerators of ExtraKind), in which case the DeclarationNameExtra is also a CXXSpecialName, (for CXXConstructor, CXXDestructor, or CXXConversionFunction) CXXOperatorIdName, or CXXLiteralOperatorName, it may be also name common to C++ using-directives (CXXUsingDirective), otherwise it is NUM_EXTRA_KINDS+NumArgs, where NumArgs is the number of arguments in the Objective-C selector, in which case the DeclarationNameExtra is also a MultiKeywordSelector. More...